Machine for polishing knives.



N0. 628,0l6. Patented July 4, I899.

G. W. MODEL.

MACHINE FOR POLISHING KNIVES.

(Application filed Mar. 14, 1898.)

(No Model.)

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PATENT CARL WILHELM MODEL, OF STUTTGART, GERMANY.

MACHINE FOR POLISHING KNIVES.

SPECIFIGATI ON forming part of Letters Patent No. 628,016, dated July 4, 1899.

Application filed March 14, 1898.

To all whom it may concern:

Beit known that I, CARL WILHELM MODEL, a citizen of the Kingdom of Wiirtemberg, residing at Feuerbach-Stuttgart, Germ any,have invented a new and useful Improvement in Knife-Polishing Machines,of which the following is a specification.

This invention relates to means for polishing knives; and its object is to provide a machine which will be particularly useful for manipulation by hand and in which the introduction of the knife-blade will not interfere with the driving mechanism. Its object is, moreover, to provide a suitable guide for maintaining knives of different thicknesses in proper position with relation to the polishing or abrading machine and also to provide an effectual means for mounting the polishing or cleaning wheels on their shafts.

With these objects in view my invention consists in the means, features, and combination of parts hereinafter described, and more particularly pointed out in the claims.

In the following detailed description of the manner in which I carry my invention into effect reference is made to the accompanying drawings, in which- Figure 1 represents a side elevation of. a knife-polishing machine embodying my invention; Fig. 2, a plan view thereof, and Fig. 3 a diametrical section of one of the polishing or abrading disks. r

By referring to the drawings it.will be noticed that the machine embodying my invention comprises two polishing rollers or disks A A, which are fixed or keyed on the parallel horizontal shafts B B, the said shafts being journaled in the frame G of the machine at such a distance from each other that the two disks A A will touch, or nearly touch. The point of contact is the place where the knife-blades to be cleaned and polished are inserted. The shafts B B are provided at a point outside of the supporting-frame Gwith the cog-wheels c 0, respectively. The cogwheels 0 c mesh with similar cog-wheels C O, journaled in the frame G below the cog: wheels 0 c. The cog-wheels O O, and therefore their companion cogs c c, are rotatedfrom a horizontal shaft F, driven by any suitable power by means such, for example, as the crank f, through the medium of the bev- Serial No. 673,823. (No model.)

eled cogs D D, fixed on the shaft F, and the corresponding beveled cogs (Z d, meshing with the former and fixed to the shaft of the cog-wheels G C. By this means it will be noted that I am enabled to drop the main shaft F considerably below the point at which the knife-blade is introduced into the bite of the polishing-disks A A. I am thus enabled to arrange the actuating parts of the knifepolisher in such a way that the knife-blade when inserted into the machine and protruding beyond the polishing-disks will in no Way interfere with said actuating means. At the same time this construction enables me to bring the said actuating or driving means closely up to the main frame G and the polishing-disks. It is obvious that this results in a much more compact structure, whereby the same takes up less space and may be made stronger with a less amount of material than the polishing-machines hitherto known.

Another.feature of my invention consists in the manner of mounting the'polishing-disks on their shafts. This is best disclosed in Fig. 3, from-which it will be noted that a polishing-disk under my invention consists of an iron core or pulley a, which pulley is fixed to the shaft 13 or B in any suitable way. On the periphery of the core or pulley A is seated a ring or annulus r, of ebonite or hard rubher, the latter being in turn encircled by a ring or annulus 0, of soft rubber, preferably made of considerable thickness. On the latter soft-rubber ring 0 finally is mounted the outer ring or coating, consisting of any suitable material for polishing and cleaning or abrading, such as leather or felt. The hardrubber or ebonite ring 9" is fixed upon the iron core or pulley A in any suitable way-such, for example, as by dovetailed joints, slots and tenons, or the like. ring is mounted on the ebonite or hard-rubber ring without any further provision, being held firmly thereon by means of its elasticity and friction, as will be understood. The polishingdisk A is fixed with respect to The soft rubber the frame G, while the other disk A may be" IOO best in Fig. 2, a horizontal slot being provided in said frame G, which will permit of the horizontal movement of the journal portion of the strap or yoke in the said frame. The yoke H, and with it the disk A, are yieldingly pressed toward the disk A by means of a spiral spring 41, which bears against said yoke at one end and encircles a stem 2', secured to and extending from the frame G. The other end of the spring 2" bears against a nut h, engaging the outer threaded portion of the stem '5. By adjusting the nut 77. on the threaded stem '5 the tension of the spring 11, and hence the yielding pressure of the disk A against the disk A, may be increased or diminished.

A further feature of myinvention consists in the adjustable guides for the knife-blade to be polished. These consist of a shelf M, arranged, preferably, adj ustably on the frame G at a point opposite to or somewhat below the point of contact of the disks A A. This shelf M may be rendered vertically adjustable by means of aslot and set-screw m, as shown. Upon the shelf M are mounted the two guards M M, consisting of the upwardlyextending wings m which, as shown, are upwardly flaring and form the guiding groove or slot, into which the protruding portion of the knife-blade passes as it isintroduced between the polishing-disks and the lower horizontal wings m which rest upon the shelf M. Each guard M is made horizontally adjustable by any suitable means, such as the set-screw-and-slot connection shown in the drawings. By this means the knife-guide is rendered adjustable, so as to be adapted to receive knife-blades of diiferent thicknesses.

In operation the knife is inserted between the two abrading or rubber disks A A, and its protruding end is inserted into the guard M with the one hand, preferably the left hand. The crank F is then turned and its movement through the gearings D D (Z d C G c c is imparted to the shafts D D and the disks A A, and the knife, being drawn back and forth in the bite of the abrading-disks, is polished. If the pressure of the abradingdisks is too great or too small, it is readily adjusted by manipulating thenut it. By shifting the shelf M vertically and the guards M M horizontally with respectto each other the machine may readily be adjusted to suit knifewith an operatinggear on its shaft, inter-' meshing gears arranged below the shafts of said rollers or disks, with their axes parallel to said shafts, and a main driving-shaft arranged at right angles to and intersecting the axes of the lowermost gears, and engaging therewith, substantially as shown and described.

2. A disk for polishing, anda similar machine consisting of a central core, a ring or annulus ofhard rubber surrounding the same and fixed thereon, a second ring or annulus ofsoft rubber mounted on the latter and maintained thereon of-its own elasticity and friction and an outer covering or rim of polishing material, substantially as set forth.

3. In a polishing-machine the combination with a pair of polishing-disks of a verticallyadjustable shelf arranged near the point of contact of the said disks, and a pair of horizontally-adjustable guards mounted on said shelf and forming a guide for the knife to be polished.t

In testimony whereof I aflix my signature in presence of two witnesses.

CARL WILHELM MODEL.

Witnesses: AUGUST B. DRAUTZ, N. WAGNER. 

